Epson 100" EpiqVision Ultra LS500 4000-Lumen Pixel-Shift 4K UHD 3LCD Laser Projector TV System with 100" Screen (White Projector) - Manual (Page 25)

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3 Arrow buttons (move through on-screen options)
4 Enter button (selects options)
5 Menu button (accesses projector menus)
6 volume up and volume down buttons
7 rewind, play/pause, and fast forward buttons (control connected streaming device)
8 keystone button (corrects vertical/horizontal image distortion)
9 mic button (operates Android TV using voice commands)
10 Source button (changes the input source)
11 Home button (accesses Android TV Home screen)
12 App buttons
13 A/V mute button (turns off picture and sound)
14 Command light (turns on when the remote control is in operation)
15 Microphone (listens for voice commands after pressing the mic button)
16 Remote control emitter